Constraining the population of isolated massive stars within the Central Molecular Zone

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Table A.1.

Census of massive stars in the sightline towards the GC.

ID	RA	Dec	J	H	K	Aliases	Classification
[DWC2011]	(h m s)	(d m s)	(mag)	(mag)	(mag)		Old	New
OB supergiants
50	17 45 02.89	−29 08 59.8	13.9 ± 0.05	11.4 ± 0.02	9.9 ± 0.01	CXOGC J174502.8-290859	O9-B0 Ia	–
95	17 45 59.44	−28 52 50.7	14.9 ± 0.02	12.1 ± 0.01	10.5 ± 0.02		–	O9 Ia
	17 44 45.02	−29 19 30.7	14.37	10.97	9.07	2MASS J17444501-2919307	B2-3 Ia⁺	[B0-3 Ia]
	17 45 29.89	−28 54 28.9	–	12.2	10.8	S152	–	O4-5 Ia
	17 45 30.32	−28 52 07.0	–	13.4	11.9	S73	–	O4-5 Ia
	17 45 37.30	−28 53 53.7	15.75 ± 0.02	12.80 ± 0.01	11.23 ± 0.01	CXOGC J174537.3-285354	O9-B0 Ia	Similar
	17 46 28.31	−28 39 20.5	16.99 ± 0.07	13.36 ± 0.03	11.49 ± 0.04	CXOGC J174628.2-283920	O4-6 Ia	–
	17 47 03.14	−28 31 20.2	16.23 ± 0.03	13.03 ± 0.01	11.27 ± 0.01	CXOGC J174703.1-283119	O4-6 Ia	–
	17 47 25.41	−28 25 23.0	–	13.37 ± 0.01	11.30 ± 0.04	CXOGC J174725.3-282523	O4-6 Ia	–
WN7-9ha/O hypergiants
15	17 46 03.21	−28 48 58.4	–	13.2 ± 0.05	11.7 ± 0.03		–	O4-5 Ia⁺
22	17 45 53.40	−28 49 36.9	15.4 ± 0.02	12.5 ± 0.02	11.0 ± 0.01	[MCD2010] 12	WN8-9ha	–
23	17 46 10.01	−28 55 32.4	15.0 ± 0.02	12.3 ± 0.02	10.8 ± 0.02	[MCD2010] 15	WN8-9ha	O6-7 Ia⁺
35	17 45 28.62	−28 56 05.0	14.5 ± 0.02	11.5 ± 0.02	9.7 ± 0.03	CXOGC J174528.6-285605, GCCR073	O If⁺	WN8-9ha +neb
36	17 45 31.50	−28 57 16.8	15.1 ± 0.02	12.7 ± 0.01	11.4 ± 0.02	[MCD2010] 6, CXOGC J174531.4-285716	O4-6 Ia	O4-5 Ia⁺
75	17 46 17.10	−28 51 31.5	15.0 ± 0.03	12.1 ± 0.12	10.5 ± 0.02	CXOGC J174617.0-285131	O6 If⁺	WN8-9ha/O6-7 Ia⁺
77	17 46 17.54	−28 53 03.5	15.0 ± 0.02	12.1 ± 0.01	10.5 ± 0.02	[MCD2010] 16	WN8-9ha	–
96	17 45 48.57	−28 50 05.7	17.6 ± 0.10	13.3 ± 0.02	11.0 ± 0.02	WR102a	WN8/Of	WN7-8ha
97	17 45 47.72	−28 50 49.2	15.3 ± 0.19	12.3 ± 0.09	10.7 ± 0.06		O4-6 Ia⁺	O6-7 Ia⁺
100	17 45 42.32	−28 52 47.1	14.7 ± 0.02	11.7 ± 0.02	10.1 ± 0.03	[MCD2010] 10	O4-6 Ia⁺	O7-8 Ia⁺
107	17 45 39.34	−28 53 21.1	14.7 ± 0.02	11.8 ± 0.01	10.2 ± 0.01		O4-6 Ia⁺	O7-8 Ia⁺
111	17 45 36.12	−28 56 38.7	15.6 ± 0.03	12.3 ± 0.01	10.4 ± 0.02	CXOGC J174536.1-285638, GCCR107	WN8-9ha	–
114	17 45 32.78	−28 56 16.6	14.7 ± 0.02	12.1 ± 0.01	10.7 ± 0.01	CXOGC J174532.7-285617, GCCR110	O4-6 Ia	O4-5 Ia⁺
134	17 45 16.74	−28 58 25.1	16.7 ± 0.06	13.1 ± 0.03	11.1 ± 0.02	CXOGC J174516.7-285824	WN7-8ha	–
	17 46 18.79	−28 49 48.4	–	12.5	11.1	S131	–	O7-8 Ia⁺
	17 46 20.87	−28 46 58.8	–	14.1	12.5	S120	–	WN8-9ha
	17 46 56.36	−28 32 32.3	–	13.74 ± 0.05	11.24 ± 0.02	CXOGC J174656.3-283232	WN8-9ha	–
	17 47 11.47	−28 30 07.0	16.56 ± 0.06	12.72 ± 0.02	10.54 ± 0.01	CXOGC J174711.4-283006	WN8-9ha	–
	17 47 12.25	−28 31 21.6	17.06 ± 0.07	13.07 ± 0.01	10.78 ± 0.02	CXOGC J174712.2-283121	WN7-8ha	–
	17 47 13.03	−28 27 08.2	–	14.22 ± 0.01	11.86 ± 0.01	CXOGC J174713.0-282709	WN7-8ha	–
WN9-11h stars/early-B hypergiants
19	17 45 48.61	−28 49 42.2	–	13.6 ± 0.03	11.1 ± 0.01	[MCD2010] 11	WN8-9h	WN9h(broad)
56	17 46 27.60	−28 46 11.8	14.4 ± 0.02	11.3 ± 0.01	9.5 ± 0.04	[MCD2010] 18	PCyg O Ia	WN11h
98	17 45 41.27	−28 51 47.7	14.8 ± 0.02	11.6 ± 0.01	9.9 ± 0.01	[MCD2010] 9	O9-B0 If+	B1-2 Ia⁺/WNLh
103	17 46 01.65	−28 55 15.3	13.4 ± 0.01	10.7 ± 0.01	9.1 ± 0.05	[MCD2010] 13	PCyg OIa	B0-1 Ia⁺/WNLh
137	17 45 16.17	−29 03 14.7	11.6 ± 0.03	9.2 ± 0.03	7.9 ± 0.03	CXOU J174516.1-290315, GCCR082	Ofpe/WN9	WN10h
	17 45 23.11	−29 03 29.3	16.7 ± 0.03	12.7 ± 0.02	10.3 ± 0.02	SSTU J174523.11-290329.3	B0-2 Ia	[B0-2 Ia⁺]
	17 45 54.65	−28 47 44.9	–	9.5	7.9	S132	–	B1-3 Ia⁺
	17 46 12.93	−28 49 00.2	13.79	10.53	8.85	2MASS J17461292-2849001	–	[B1-3 Ia⁺]
	17 46 18.12	−29 01 36.6	12.97 ± 0.02	10.27 ± 0.03	8.84 ± 0.03	WR102ka	WN10h	–
Cool BHGs/sgB[e] stars
40	17 45 24.06	−29 00 58.9	13.2 ± 0.03	10.4 ± 0.04	8.8 ± 0.11	[MCD2010] 5, 2MASS J17452405-2900589	B0-2 Ia	sgB[e]
112	17 45 37.81	−28 57 16.2	–	13.1 ± 0.02	10.7 ± 0.02	2MASS J17453782-2857161	B[e]	late BHG/LBV?
141	17 45 09.29	−29 08 16.2	–	15.3 ± 0.05	11.7 ± 0.02	2MASS J17450929-2908164	–	late BHG/LBV?
	17 44 43.20	−29 37 52.6	16.00	12.78	10.14	2MASS J17444319-2937526	uncl.	[late BHG/LBV?]
	17 44 55.38	−29 41 28.5	16.72	12.63	10.14	2MASS J17445538-2941284	uncl.	[late BHG/LBV?]
	17 45 02.41	−28 54 39.2	15.81	12.56	10.00	2MASS J17450241-2854392	uncl.	[late BHG/LBV?]
	17 47 09.40	−28 49 23.6	12.66	10.8	9.46	2MASS J17470940-2849235	uncl.	[late BHG/LBV?]
	17 48 24.73	−28 24 31.3	15.86	12.12	9.54	2MASS J17482472-2824313	uncl.	[late BHG/LBV?]
WN5-7 stars
2	17 46 23.81	−28 48 10.8	16.3 ± 0.05	13.3 ± 0.01	11.4 ± 0.02	[MCD2010] 17	WN5b	[WN5-6b]
34	17 45 50.55	−28 57 26.1	15.8 ± 0.03	12.9 ± 0.03	11.3 ± 0.01	[MCD2010] 19	WN5b	WN6
39	17 45 22.70	−28 58 44.1	–	15.2 ± 0.06	12.2 ± 0.03	CXOGC J174522.6-285844	WN5-6b	Similar
91	17 45 55.38	−28 51 26.0	15.4 ± 0.19	12.5 ± 0.04	11.0 ± 0.07	CXOGC J174555.3-285126	WN5-6b	Similar
99	17 45 38.68	−28 52 10.5	–	16.4 ± 0.06	13.9 ± 0.02		–	WN5-6
109	17 45 50.61	−28 59 19.6	15.4 ± 0.02	12.5 ± 0.01	10.9 ± 0.01	WR102b, CXOGC J174550.6-285919, GCCR085	WN7	WN6-7
147	17 45 08.98	−29 12 17.9	15.1 ± 0.03	12.6 ± 0.02	11.1 ± 0.04	CXOGC J174508.9-291218	WN7	WN6-7
150	17 45 15.05	−29 14 36.2	–	14.5 ± 0.02	12.7 ± 0.03		–	WN5
WC8-9 stars
28	17 45 57.76	−28 54 45.8	16.3 ± 0.03	13.4 ± 0.01	11.4 ± 0.02	WR 101q	WC8-9	Similar
42	17 45 32.50	−29 04 58.0	–	14.6 ± 0.02	12.0 ± 0.01	[MCD2010] 8	WC9	–
49	17 45 21.89	−29 11 59.6	–	14.7 ± 0.03	12.7 ± 0.03	[MCD2010] 3	WC9	Similar
53	17 45 07.07	−29 12 00.6	16.8 ± 0.07	13.5 ± 0.02	11.1 ± 0.03	[MCD2010] 2	WC9?d	Similar
94	17 46 02.59	−28 54 14.0	16.4 ± 0.04	13.5 ± 0.02	11.6 ± 0.02	[MCD2010] 14	WC9	–
101	17 45 42.47	−28 52 53.3	16.3 ± 0.04	13.2 ± 0.01	11.2 ± 0.02	WR101p	WC8-9	Similar
151	17 45 09.80	−29 14 13.1	15.6 ± 0.03	13.0 ± 0.01	11.1 ± 0.02	[MCD2010] 4	WC9?d	Similar
	17 43 21.73	−29 51 43.0	14.03	9.37	6.48	2MASS J17432173-2951430	uncl.	[WCLd]
	17 43 29.88	−29 50 07.4	17.54	12.56	8.82	2MASS J17432988-2950074	uncl.	[WCLd]
	17 44 37.35	−29 27 55.7	17.56	13.91	10.29	2MASS J17443734-2927557	WCLd	–
	17 44 40.83	−29 26 55.1	16.76	12.81	9.40	2MASS J17444083-2926550	WCLd	–
	17 45 04.84	−29 11 46.5	15.02	11.63	9.04	2MASS J17450483-2911464	WCLd	–
	17 45 19.17	−29 03 22.0	17.10	13.30 ± 0.05	10.40 ± 0.05	CXOGC J174519.1-290321, MP13	WC9	Similar
	17 46 02.16	−28 57 23.5	14.87	11.43	8.08	2MASS J17460215-2857235	uncl.	[WCLd]
	17 46 32.20	−28 44 54.6	17.14	12.86	9.21	2MASS J17463219-2844546	WCLd	–
	17 46 45.25	−28 15 47.7	15.39	9.96 ± 0.03	7.18	CXOGC J174645.2-281547	WCLd	–
Classical Be stars
105	17 45 52.97	−28 55 36.9	17.69 ± 0.16	14.75 ± 0.05	13.08 ± 0.05	CXOGC J174552.9-285537, XID #3275	Be star	Similar
106	17 45 52.26	−28 56 46.1	–	16.1 ± 0.08	14.5 ± 0.13		–	Be star
108	17 45 47.04	−28 56 46.0	–	15.5 ± 0.07	14.0 ± 0.09		–	Be star
135	17 45 17.76	−28 58 19.9	–	16.1 ± 0.10	14.1 ± 00.06		–	Be star
	17 45 52.16	−28 55 01.5	–	17.4	14.6	S69	–	Be star
	17 46 12.95	−28 47 16.3	–	14.6	13.1	S124	–	Be star
Miscellaneous and uncertain classification
57	17 46 29.90	−28 46 39.9	–	14.7 ± 0.02	12.6 ± 0.02		–	MYSO/sgB[e]
58	17 46 31.85	−28 46 47.1	14.3 ± 0.02	12.6 ± 0.01	11.6 ± 0.01		–	MYSO
	17 43 10.02	−29 51 46.1	17.01	13.91	11.58	2MASS J17431001-2951460	uncl.	[MYSO]
	17 44 48.40	−29 02 16.4	13.81	12.08	10.34	2MASS J17444840-2902163	uncl.	[YHG]
	17 47 09.22	−28 46 16.2	14.21	12.58	10.18	2MASS J17470921-2846161	uncl.	[MYSO]
	17 45 28.88	−28 57 26.4	16.23 ± 0.06	13.29 ± 0.03	11.61 ± 0.03	XID #947, GCCR072	O star?	–
	17 45 51.54	−29 00 23.2	–	14.88	11.43	[HJB85] Sgr A-D	LBV/ucH II	ucH II
Foreground ((H − K)≤1) and unclassifiable
25	17 45 58.31	−28 52 20.0	–	–	13.4 ± 0.06		–	Uncl.
38	17 45 37.99	−29 01 34.5	11.1 ± 0.05	9.7 ± 0.05	8.9 ± 0.13	[MCD2010] 7, CXOGC J174537.9-290134	O4-6 Ia	O4 Ia
102	17 45 44.04	−28 53 16.8	15.0 ± 0.02	13.3 ± 0.03	12.4 ± 0.04		–	Be star
110	17 45 48.94	−28 59 01.8	–	15.7 ± 0.04	14.3 ± 0.03		–	Uncl.
140	17 44 59.46	−29 05 25.9	8.8 ± 0.03	7.7 ± 0.04	7.0 ± 0.03	[MCD2010] 1, 2MASS J17445945-2905258	B0-2 Ia	[cool LBV]

Notes. Summary of known and candidate isolated massive stars in the sightline to the GC. Columns 1 and 7 identify the source and provide relevant aliases, Cols. 2 and 3 provide co-ordinates and 4–6 provide broadband near-IR photometry. Finally Col. 8 provides, where available, historical classifications for these stars and Col. 9 our new or revised classifications from this work. We highlight that a subset of such new classifications are given in square brackets – these derive from our reappraisal of published data. Where available we adopt the naming convention of Dong et al. (2011; [DWC2011] xxx) for their primary list of Paα excess sources (Col. 1), noting that S69, 73, 120, 124, 131, 132, and 152 derive from their secondary list. Additional identifications derive from Mauerhan et al. (2010b; CXOGC sources), Mauerhan et al. (2010c; [MCD2010]xx) de Witt et al. (2013 XID xxx), Geballe et al. (2019, 2MASS sources) and Zhao et al. (2020; GCCRxxx). In all cases photometry (and associated errors where available) and classifications were obtained from these works, supplemented by Homeier et al. (2003), Mauerhan et al. (2007), Clark et al. (2009b), Oskinova et al. (2013), de Witt et al. (2013), and Dong et al. (2015) where required.

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